Shaping machine for shoe uppers

ABSTRACT

A shaping machine for shoe uppers over lasts, comprising stretching bands, where the stretching force of said stretching bands is for each wiping unit adjusted independently from the adjustment of the force pressing the lasting margin against the midsole in the course of their cementing, whereby the distance and relative height of each wiping unit with respect to the midsole is adjustable. A universal application of this machine for any kind and shape of shoes is thus achieved.

n51 3,678,522 51 July 25, 1972 United States Patent Bumbatek et a].

UNITED STATES PATENTS [54] SHAPING MACHINE FOR SHOE UPPERS [72] Inventors: Karel Bumbatzk; Lldlsllv Oller, both of ......l2/|2 Courchene...............................I2/8 I Gonwaldov, Czechoslovakia [73] Assignee: Zavody presneho strojirenstvi Gouwlldov narodnl podnik, Gotlwaldov, Primary ExaminerPatrick D. Lawson Czechoslovakia AHOrney-RiChard Low and Murray Schafl'er Feb. 3, I97 I ABSTRACT [22] Filed:

PATENTED JUL2 5 I972 SHEET 1 0F 3 krmeL BumBfiLEk LHDIsLm/ 01.559

mvzmong an PATENTEU JUL25|972 357 522 SHEET 2 OF 3 A cared SHAPING MACHINE FOR SHOE UFPERS BACKGROUND OF THE INVENTION This invention relates to shaping of shoe uppers over lasts for cement attaching of flanged margins of these uppers in their shank or lateral parts to margins of soles, with wiping devices arranged at both sides of the shoe.

Known machines for pulling over and lasting the shank or lateral parts of the upper are for instance provided with a roller wiping device. It is an efficient and simple shaping machine, but the quality of the work depends primarily on the attendant, who holds the shoe in his hands. The main draw back of this machine is the circumstance that the margin is not stretched at the internal and external part of the shoe in the same direction, so that the margin is on one side of the shoe stretched from the heel to the tip, whereas on the opposite side in the opposite direction, with the result, that the shoe does not maintain its correct shape after being removed from the last. A more perfect stretching is achieved on compilcated machines with a wiping device comprising a larger number of wiping assemblies, which are shaped exactly according to the shape of the last, whereby the lasting margin is first pulled by tongues and subsequently pressed by the wiping devices to the midsole. The shoe on the last is in this case firmly fixed on the machine and two machines are required for pulling over and lasting the left and right shoe upper as it is impossible to use for this purpose a single machine due to substantial differences of the shank part. Another drawback of these machines is, that the stretching device with the device pressing the lasting margin, to the margin of the midsole perform the operating motion as a unit so that it is impossible to stretch on a single machine shoes of different shapes and sized without lengthy and tedious adjustments. Other shaping machines are using a wiping device which does not apply tongues and comprises pivotable adjustbale and slidable fingers, with stretching bands of a material, the shape of which is capable to adjust itself to conditions fixed with one end to said fingers and with the other end to an elastic suspension. The stretching of the upper is in this case accomplished by frictional forces generated in the course of the sliding motion of the stretching band along the upper, whereby the frictional force is adjusted by prestressing the stretching band according to the kind of treated material. A drawback of this arrangement is, that the force pressing the lasting margin to the midsole is proportional to the prestressing of the stretching band, so that for a material for uppers which does not require a big stress of the stretching bands, the lasting margin is not sufficiently pressed to the mid sole.

SUMMARY OF THE INVENTION It is an object of this invention to provide a shaping machine for the shank and lateral part of shoe uppers which could be used for shaping of uppers of shoes of different types and sizes.

It is another object of the invention to provide a shaping machine for shoe uppers capable to be used equally for left and right shoe uppers.

It is still another object of this invention to provide a shaping machine for shoe uppers, particularly of the shank and lateral part, which would be simple in design and easy to attend and which could be universally used without particular adjustments.

The shaping machine for shoe uppers over lasts, particularly of their shank and lateral parts with subsequent cementing of the lasting margins to the midsole according to this invention, comprises at least two wiping devices at both sides of the shoe with hydraulically controlled elastic or resilient wiping units with stretching bands of a material capable to adjust its shape, having one end of said stretching bands fixed to said units, while the other end of said stretching band is fixed to a resilient suspension, the machine provided furthermore with a support for supporting and securing the last with the shoe upper in the working position, the wiping devices supported swingably in the longitudinal direction of the shoe within the level of the midsole, each wiping device being composed of a number of wiping assemblies with elastic wiping units arranged side by side, individually controllable and with their position individually adjustable. The wiping devices are advantageously arranged symmetrically to a central axis of the machine passing through a bolt for deviating the support of the last with the lasted shoe upper in the horizontal direction from its left to its right extreme position, said support provided with another bolt for fixing the last, said other bolt being in operation beyond the central axis of the machine.

The improvements obtained by the shaping machine according to this invention is in the possibility to stretch the shank or lateral part of the shoe upper of all sizes and types of shoes. The machine is therefore adapted for universal application, it can be easily adjusted for the respective type and size of shoes and in addition the right and left shoe upper can be shaped on a machine with a single head without adjustment. As the magnitude of the stretching force is adjustable independently on the force required for cementing the lasting margins, the shoe upper is positively stretched without further auxiliary operations.

DESCRIPTION OF DRAWINGS The working devices of a shoe shaping machine are shown as an examplary embodiment of the object of this invention on the accompanying drawings.

FIG. 1 is a top view of a wiping asembly including the last,

FIG. 2 a section of the wiping assemblies,

FIG. 3 a side view of a part of the wiping device, and

HO. 4 the operating outline of the shaping machine.

DESCRIPTION OF PREFERRED EMBODIMENT As obvious from FIG. 1 and 2 an angle iron 3 supported by a bolt 2 is mounted in a bracket fixed on the machine frame, with a toothed segment 5 fixed to the angle iron 3 by a screw 4, the toothed segment 3 engaging with a pinion 6 mounted together with a worm wheel 7 in a case 8 fixed to the bracket 1. A worm 9 is furthermore housed in the case, connected with a rod 10, mounted in the bracket 1 and provided with a hand wheel ll. Lateral uprights I2 and I3 are fixed to the angle iron 3, with guiding rods 14 and 15 arranged between said uprights I2 and I3. Rollers 16 (FIG. 3) are rotatably mounted on the rod IS. The angle iron 3 is provided with a number of substantially vertical T" shaped grooves 11, in which grooves the wiping units are inserted.

A piston 19, the piston rod of which passes through the cover 20, is arranged in a body l8, the piston rod being connected by a bolt 21 with a guiding 22 which is slidably supported in a groove 25 in the body 18 by means of rollers 23, rotating around bolts 24. A support 26 is slidably arranged in the guiding 22, with a bolt 28 axially secured by a ring 29 rotatably supported in sleeves 27 of the support 26. An elastic wiping unit 32 provided on the other extremity with a contact piece 33 is fixed to the bolt 28 by a cover plate and screws 3!. The wiping unit 32 is made of elastic material such as for instance flat spring steel. A stretching band of a material capable to adjust its shape according to conditions is secured by a screw 34 between the wiping unit 32 and the contact piece 33, the stretching band 35 guided over the rod 14 and fixed with its other end by a clamp 36, connected with a cable 37 guided over a roller [6. A spring 38, fixed by means of a not shown suspension on the machine frame, is suspended on the other end of the cable 37.

A screw 39 axially secured in the guiding 22 is screwed in in the support 26. A screw 40 axially secured by a cover plate 4] is also in the body [8, the cover plate 4! fixed by a screw 42 to the angle iron 3. The body 18 is furthermore provided with necks 43, 44 with flexible hoses 45 and 46 for the supply and removal of pressure oil. As obvious, pans l8 to 40 form independent wiping assemblies located side by side in vertical grooves 17 of the angle iron 3 and form together the wiping device.

The machine is provided for holding and securing the last with the upper in working position with a support 47 (FIG. 4) with a bolt 48 for supporting the last 49 and with an adjustable rest 50 of the tip. The support 47 is swingable supported on an arm 52 by a bolt 51, the arm 52 being swingable in a horizontal plane, supported on a bolt 53 in a bearing 54 connected with the machine frame. The support 47 is in addition connected by the joint 55 with the piston rod of the piston 56 of the working cylinder 57, which is by means of a joint 58 suspended on the machine frame, enabling both a swinging of the support 47 around the bolt in a vertical plane and together with the arm 52 around the bolt 53 in a horizontal plane.

A heel rest 59 and a yieldable stop 60 are furthermore arranged on the machine frame. The drive ofthe machine is provided by a common hydraulic unit with an electromagnetic distributing device 6|, to the terminals 62, 63 of which the voltage from the electric circuit of the machine is supplied via a time relay 64 and a limit switch 65.

The wiping assemblies 66 shown in FIG. 4 schematically, comprising in fact the elements 18 to 40, are connected over the distributor 6| to the hydraulic unit, and are provided with a valve 67 imserted between the supply hose 46 (FIG. 2) of the wiping unit (FIG. 4) and the distributor 65, by means of which valve the wiping assembly 66 can be put out ofaction.

The operation of the machine can be followed on the hand of FIG. 4 where all operating parts are shown in their working position.

Afier the last 49 with the midsole 68 and upper 69 (FIG. 2) are placed on the bolt 48 (FIG. 4) of the support 47, the support 47 is for instance manually deviated around the bolt 51 until the heel of the upper 69 strikes the yieldable stop 60. As indicated in FIG. 1. the shoe is placed in the machine so that the width of the midsole 68 is in its length along which it should be worked, approximately uniformly distributed to both sides from the central machine axis indicated in FIG. I by This is accomplished by turning the support 47 with the arm 52 around the bolt 53.

The elastic wiping units 32 are dajusted so, that they are symmetrically like a fan arranged around the axis "a". By turning the hand wheel ll (FlG. 2) the worm 9, the worm wheel 7 and the pinion 6 engaging with the toothed segment 5 are turned by way of the rod 10, the segment 5 turning the angle iron 3 around the bolt 2, whereby the whole piping device is adjusted in the most suitable wiping plane. The elastic wiping units 32 are adjusted by screws 40 according to the longitudinal shape of the shank part of the shoe so that the lower edge of the Contact piece 33 is below the plane of the midsole 68. A force required for cementing the lasting margin of the upper 69, independent on prestressing of the stretching bands 35 is thus obtained by a larger or smaller overlapping. It is obvious that this described adjustment is performed in ad vance and is not part ofthe routine work.

Afier pushing back the yieldable stop 60 (FIG. 4), the limit switch 65 closes the electromagnet of the distributor 61, the slide valve of which is moved. The bolt 48 of the support 47 with the last 49 is lifted up to the heel rest 59. in this working position the support 47 is secured by the working cylinder 57. The wiping assemblies 66 or the elastic wiping units 32 respectively are moved into their working position indicated in FIG. 2 by broken lines. in the course of the approach of the wiping units 32 first the stretching bands 35 come in contact with the upper 69, sliding in the course of movement of the elastic wiping units 32 along the upper 69. Thus a frictional force is generated, stretching the upper. The magnitude of this frictional force is adjusted according to the kind of the upper material by adjusting the pull of the springs 38.

After lapse of the time, required for performing the operation, the time relay 64 interrupts the circuit of the electromagnet of the distributor 61, the slide valve of which is again moved and the wiping assemblies 66, the bolt 48 of the support 47 and the piston 56 of the working cylinder 57 return into their starting position and the machine is pre d for a further operation. As furthermore obvious from G. 4, each wiping assembly 66 can be put out of action by a valve 67 so that it is posible to adjust the required length for wiping according to the size of the worked shoe.

We claim:

1. A shaping machine for shoe uppers over lasts, particularly of their shank and lateral parts, and for subsequent cementing of the lasting margins of the shoe uppers to the margin of the shoe sole comprising in combination:

a support for supporting the last with the shoe upper in the working position.

at least one wiping device on each side of the worked shoe each wiping device composed of a number of independent wiping assemblies,

each wiping assembly having a resilient wiping unit,

stretching bands of a material capable to adjust its shape to require conditions,

one end of said stretching band fixed to each wiping unit,

the other end of said stretching band fixed to a resilient suspension on the machine frame,

means for adjustment of the pull of said resilient suspension,

each of said wiping devices supported swingably in the longitudinal direction of the shoe,

means for independently controlling each wiping assembly,

means for independently adjusting the position of each wiping assembly with the resilient wiping unit as to its distance from the midsole and as to its height with respect to the level of the midsole.

2. A shoe shaping machine as set forth in claim 1 with means for independently adjusting the force acting on each wiping unit in the course of wiping and the force acting on the wipers in the course of pressing the lasting margins against margins of the midsole in the course of cementing.

3. A shoe shaping machine as set forth in claim 1 said wiping devices arranged substantially symmetrically with respect to a central axis.

4. A shoe shaping machine as set forth in claim 3, the last supported by a support on a first bolt, said support in turn supported by an arm, pivotable in a horizontal plane around a second bolt.

5. A shoe shaping machine as set forth in claim 4, said first bolt being in operation beyond said central axis, while said central axis passes through said second bolt. 

1. A shaping machine for shoe uppers over lasts, particularly of their shank and lateral parts, and for subsequent cementing of the lasting margins of the shoe uppers to the margin of the shoe sole comprising in combination: a support for supporting the last with the shoe upper in the working position, at least one wiping device on each side of the worked shoe part, each wiping device composed of a number of independent wiping assemblies, each wiping assembly having a resilient wiping unit, stretching bands of a material capable to adjust its shape to require conditions, one end of said stretching band fixed to each wiping unit, the other end of said stretching band fixed to a resilient suspension on the machine frame, means for adjustment of the pull of said resilient suspension, each of said wiping devices supported swingably in the longitudinal direction of the shoe, means for independently controlling each wiping assembly, means for independently adjusting the position of each wiping assembly with the resilient wiping unit as to its distance from the midsole and as to its height with respect to the level of the midsole.
 2. A shoe shaping machine as set forth in claim 1 with means for independently adjusting the force acting on each wiping unit in the course of wiping and the force acting on the wipers in the course of pressing the lasting margins against margins of the midsole in the course of cementing.
 3. A shoe shaping machine as set forth in claim 1 said wiping devices arranged substantially symmetrically with respect to a central axis.
 4. A shoe shaping machine as set forth in claim 3, the last supported by a support on a first bolt, said support in turn supported by an arm, pivotable in a horizontal plane around a second bolt.
 5. A shoe shaping machine as set forth in claim 4, said first bolt being in operation beyond said central axis, while said central axis passes through said second bolt. 